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摘要
In this study, indoor nitrogen-contaminated sediment remediation experiments has been conducted via pore water electrokinetic drainage equipment, with novel electrokinetic geosynthetics (EKGs) as electrode. Performance of endogenous nitrogen separation from sediments matrix as well as the characteristics of fractional nitrogen migration and transformation under intermittently (12h On /12h Off) and continuously powered scenarios has been assessed. The volume and moisture content of sediment was 0.06m3 and 72.82%, the initial contents of total nitrogen (TN), ammonia nitrogen (NH4+-N) and nitrate nitrogen (NO3--N) in sediment was 2350.16mg/kg, 1635.38mg/kg and 297.02mg/kg, respectively. After 8days of remediation with voltage gradient of 1V/cm, the total pore water drainage volume was 8535mL and 8370mL for intermittently and continuously powered group, respectively, and gravity drainage accounted for 80.43%~82.02% of the total volume. Electromigration was the main driving force for migrating fractional nitrogen in the sediment matrix, and TN separation amount was 544.48mg and 552.26mg for intermittently and continuously powered group, respectively. Moreover, 80.71% and 78.02% of separated TN was originated from the cathode effluent. After the remediation, the sediment moisture contents decreased by 4.95%~6.16%, and the average NH4+-N removal rates for intermittently and continuously powered group was 40.41% and 39.27%, while 25.82% and 27.94% for NO3--N removal, respectively. When considering the two factors of TN removal rate and energy consumption, intermittently powered was a relatively cost-effective mode with 32.61 % of the sediment TN removal rate and 15.57(kW?h)/m3 of the power consumption.
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